I am wondering, why do the Scandinavian language courses for English speakers don't have courses for the reverse. It seems odd to me considering that most language courses for English speakers here have the reverse trees.

Very few native speakers of the Scandinavian languages cannot speak English. English is a main language of higher education in some universities and most speakers of Swedish, Norwegian and Danish can understand one another in their native language but many will switch to English if either of the listeners become confused. The only common exception might be older people who learned German instead.

Yet there is a Dutch-to-English course though The Netherlands is the country with the highest percentage of English-as-a-second-language-speakers-in-a-country-where-English-isn't-the-official-language-of-the-government, hovering around 95%(?). And there aren't any Dutch-to-French/German/Spanish or versa courses... (-.-)

I thought it is because the Scandinavian languages are in the same family as English, but Finnish is a Uralic language and German and Dutch have reverse trees. None of these countries have English as official language.

I'd like to see an Afrikaans course. It is in use through out South Africa along with ten other official languages. Afrikaans speaking people love their language and are concerned about the language dying, so there would certainly be people who are keen to help. There is a Professor of Afrikaans at Stellenbosch University; amongst his responsibilities is the decision as to new words to be included in the Afrikaans dictionary. I mention this, because, he would be the person to approach about setting up a Duolingo Afrikaans course.